Motor drive



ug. 10, 1937. B. l. KAsslNG 2,089,381

` MOTOR DRIVE Filed Aug. 17, 1935 JNVEN TOR. BURTON I. KASSING.

BY f;

ATTORNEY Patented Aug. 10, 1937 PTNT GFFIC MOTOR DRIVE Burton I. Kassing, Utica, N. Y., assigner to Remington Arms Company, Inc., a corporation of Delaware Application August 17, 1935, Serial No. 36,640

4 Claims.

This invention relates to variable speed drive mechanism, and contemplates mechanism for mounting an ordinary constant speed electric motor upon the frame of a machine to be driven 5 thereby in such a way as to provide for driving the machine at differing speeds.

More specically, the invention contemplates driving devices for a machine equipped with a stepped or cone pulley from a motor provided with a single pulley, and so shifting the motor longitudinally of the machine as to align its pulley with different steps of the cone, and simultaneously shifting the motor transversely to enable the use of the same driving belt between the motor pulley and different steps of the cone.

In the drawing:

Fig. 1 is a plan view of the motor supporting and shifting mechanism, the motor itself being omitted.

20 Fig. 2 is an end elevation of the drive mechanism, the motor and the cone pulley driven thereby being indicated in broken lines.

The motor I0 comprises the usual single pulley I I driving a belt I2 which passes over one of the steps of a cone pulley I3. The motor is provided with the usual base I4. To the base I4 is secured, by suitable means such as bolts I5, a frame or subbase I6 which is suitably supported on a shifting frame identied generally by the numeral Il. Means for this purpose may comprise downwardly extending ears I8 on the sub-base IB, which ears are apertured to receive a rod I9, the ends of which are drilled and tapped to receive threaded screws 29 and 2| supported in ears 22 upstanding from the shifting frame Il. By moving the rod I9 along the screws 20 and 2|, the tension on the belt I2 may be adjusted. As shown in Fig. 2, the center of gravity of the motor is on the opposite side of the rod I9 from the cone pulley I3; thus, the tendency of the motor to rotate about the rod I9 places added tension upon the belt I2. The motor supporting devices above-outlined are substantially similar to those disclosed in the patent to Hamerstadt, No. 1,935,- 878, November 21, 1933, and are not per se a part of the present invention.

The frame Il is movably mounted upon a stationary frame secured to the bed of the machine, which bed also supports the cone pulley I3. As shown in the drawing, said stationary frame comprises longitudinal plates 23 and 24 secured to transversely extending angle bars 25 and 26 by suitable means such as bolts 21. The plates 23 and 24 comprise diagonally extending slots 28, which slots receive bolts 29 depending from the shifting frame Il. Movement `of bolts 29, and with them the motor, in slots 2B from the position shown in Fig. l carries the motor forward and to the right in said iigure; thus, increasing the distance between motor pulley II and the cone pulley I3 as the pulley Il is aligned with different steps of the cone pulley I3 by an amount suicient to maintain the same belt length between the driving and driven elements.

Suitable means are provided for shifting the frame I'I, one form of which may be constructed as follows:

To one of the bolts 29 is pivoted a link 39 which is joined at 3l to a lever 32 pivoted at 33 in the fixed frame. into a handle 34. By movement of the handle 34 the shifting frame and the motor can be moved to a position in which the pulley II is aligned with any desired step of the cone pulley I3. The shifting frame and motor are then set in the desired position by suitable devices such as a clamping nut 35 provided with an operating handle 36 and applied to the pivot 33 of the lever 32. Due to the arrangement of the motor with respect to the supporting rod I9, any tendency of the motor to creep back to a position which would slacken the belt I2 is overcome by the tendency of the weight of the motor to rock to the right (Fig. 2) about the rod I9 and thus maintain the belt under proper tension. For these reasons, friction on the pivot of the motor moving lever is suicient to hold the motor in the desired position of adjustment.

While one particular form of the mechanism for the accomplishment of the objects of the in- Y vention has been illustrated and described in detail, it will be understood that the invention is susceptible to embodiment in many other forms, all falling within the scope of the appended claims, which are to be broadly construed.

What is claimed is:

1. In combination, a motor comprising a motor shaft, aV sub-base secured to said motor, a support for said sub-base adjustably mounted in a shifting frame, a iixed frame comprising slots extending obliquely to said motor shaft, and means projecting from said shifting frame received in said slots, whereby movement of said means in said slots shifts the motor in a direction oblique to said motor shaft.

2. In combination, a motor comprising a motor shaft, a sub-base secured to said motor, a support for said sub-base adjustably mounted in a shifting frame, a fixed frame comprising slots extending obliquely to said motor shaft, means The loose end of lever 32 is formed projecting from said shifting frame received in sai-d slots, and manipulative means joined to said shifting frame for simultaneously moving said shifting frame longitudinally and transversely with respect to said fixed frame.

3. In combination, a motor comprising a motor shaft, a sub-base secured to said motor, a support for said sub-base adjustably mounted in a shifting frame, a xed frame comprising slots extending obliquely to said motor shaft, means projecting from said shifting frame received in said slots, manipulative means joined to said shifting frame for simultaneously moving said sluiting frame longitudinally and transversely with respect to said fixed frame, and means for holding said shifting frame in any desired position of adjustment upon said Xed frame.

4. In combination, a motor comprising a motor shaft, a sub-base secured to said motor, a support for said sub-base adjustably mounted in a shifting frame, a fixed frame comprising slots extending obliquely to said motor shaft, means projecting from said shifting frame re* ceived in said slots, a link joined to said fixed frame, a lever joined to said link and pivoted in said fixed frame, and means for holding said lever in a desired position of adjustment.

BURTON I. KASSING. 

